System and method for draft safeguard

Details System and method for draft safeguard System and method for draft safeguard

2005-02-08

2005-02-08

Lu, Jiping (Department: 3749)

Combustion

Timer, programmer, retarder or condition responsive control

C431S078000, C431S080000

Reexamination Certificate

active

06851948

ABSTRACT:
A gas furnace responsive to a thermostat includes a thermal switch wired in series between the furnace power supply and the thermostat. A microprocessor connected to the thermal switch detects when the switch opens and closes, carrying out prearranged programs in response thereto. The thermal switch is mounted so that it opens when an over-pressure in the furnace draft system is detected, as evidenced by hot flue gasses passing over the thermal switch probe. The switch is allowed to cycle at least one time before the furnace is disabled. After a certain period of the time, the combustion cycle is reinitiated and the above steps are repeated if the thermal switch again resets.

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patent: 4951870 (1990-08-01), Ballard et al.
patent: 5488218 (1996-01-01), Olsen et al.
patent: 6305369 (2001-10-01), Garloch

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